System of motor control.



.L Mmm, SYSTEM of' Mama s nvellll VIILIHW m APPLIOATION I'ILEI) MAE. 8, i905.

Tigri@ n Ita No. 874,025. Mmmm mi 190?,

` L Mmm MQTOR commi, PEL'IOATIOF MLB!) MARA 8. 1905.

2 SHEETGESEEET 2.

mv@ mit@ 1 YANDER MCIVER, OF SGHENECTADY, NEW Y0@ COE fieri .Alon filed 'ystem I 'm pro ve s man ts in 0f wuch the fukin therewith a relay G, G or G2, each oiC which comprises au electroinagiiet g, to the core oi which is secured a inovable Contact piece g arranged, when the electroinagnet is denergif/Jed, to bridge liked contacts g2 and {,i, and, when the electroni agnet is energized, to conneet together contacts g4 and g5. An additional relay H coininon te all of the switches is provided. This relayconsists of an electroinagiiet having two coils, a coarse coil it arranged in the motor circuit, and a tine coil 7i. arranged 'in the actuating circuit oi the. nia-in switches A to D. The core of the electroniagnet carries a movable contact piece ft2 which bridges the fixed contacts i' and 72.4 when the relay is denergized. The various electrica-l connections between the auxiliary contacts and vthe relay contacts will appear upon tracing the cont-rol circuits.

rlhe normal condition ot the parts is that illustrated. Upon moving the switch lS td its tinal position, the main switch Il will be closed in the manner previously described, and current will flow from the current collecting device 'l through the switch S, coil if, of relay H, contacts of relay H, actuating coil of relay G, auxiliary cont-acts 5, l1, and 6 of the auxiliary contacts associated with niain switch A, actuating coil (tot the inaiii switch A, wire 14, to ground. The relay G is quick-acting so that immediately upon the completion of the' circuit ol the relay, the movable contact nicinber of the relay is lifted and the actuatii'ig circuit for succeeding inain switches broken hut a second actu ating circuit is established for the-actuatiiig coil of the ina'in switch iL-nainely, from the switch S, through the coil lt', through wire l5, contacts {,r'", g coil (ii-relay G, and through the 'coil u as hefore. The inainswitch A and the relay il act.- inorc slowly than the .relay G and are both operated subsequently to the operation of the relay G. ln closing, the inain switch A establishes a maintaining circuit for itself, nainely, the actuating circuit oi the coilf is interrupted at. the contacts i and 2 and is again completed at contacts 3 and 4,-- whereupon it passes through the actuating coil u, and then through wire 14, to ground, as before.' Switch A will be held closed as long as the switch 5:3 is held in its lirst or its second operative positions. relay Cf remains energized until the niain switch closed, and, since the relay G controls ie actuating circuit oi the switch B. the aotuating coil ot this latter switch come energized until the inain closed and the core of relay G suhsefi uentiy dropped.

l i' .Action of the relay ll is to prevent the sii'itches B, t) and l) from closing whenever the motor current above a predeterniined value. This is accomplished by incans of thc coil .fi of the relay which is in and y", and actuating i lt noted thatthe inotor circuit and which serves `to maintain the core of the relay lifted whenever the motor current exceeds a predetermined value.

The actuating circuit fjor the main switch B passes through the contacts 7 and 8 associated withr the ina-in switch A through the contacts g2 and g3 to the relay G, and through the contacts of the relay H: consequently it is impossible for switch B to close except when all oi these contacts are in their closed positions, namely, switch A must he closed, the relay G must be denergized and the core oli relay H must be in its lower position. it is evident, therefore, that it is inipossihle for switch B to close iniinedi'ately after switch A closes, since a predetermined time interval inust elapse after the switch A has been closed, by reason of the dropping ol the core of relay (i, since this relay is only deiiergized upon the closing of the inain switch. This interval of time is ample to permit the relay ll to become liiily actuated and to be held in its circuit breaking position if the inotor current is being increased too rapidly. An additional time intervatis provided owing to the niechanical construction of the switch units to be hereinafter described.

When the parts are in the positions shown, and the switch S and the main switch A, together with its auxiliary contacts, have been actuated, current flows l'roin the current collectinpr device through the switch S, through the coil i of relay il, through the contacts ol this relay, through the lower contacts ol relay (lr, auxiliary contacts 7 and S associated with the inain switch A, through the coil of relay il', through contacts and t3 ot' the auxiliary contacts associated with main switch B, through the actuating coil l), wire I4, to ground. lhereupoii relay G is quickly operated, the main switch B is closed and the con acts atfrclay llare opened, and, upon the closing ol main switch l, thc relay G is again deiiergized. All these operations take place in precisely the saine way and in the saine sequence as the similar operations which serve to close thc main switch A, and which have just been described. Similarly, switches and l) are operated, each a predetermined interval alter the preceding switch, and then only when the inotor current is less than a predetermined value. Since switch l) is the last of the group adapted to close in automatic succession, no auxiliary relay is necessary for this switch and the auxiliary contacts corresponding to contacts 7, 8, and lf.) of the remaining switches are omitted since these auxiliary contacts operateonly to complete the actuating circuit of a follow'- ing switch.

In Fig. .2 l have shown a somewhat difforent construction, in which the main relay Il is oi'nitted and each ol' the auxiliary relays is provided with a throttle coil in series with respect'. actuating coil r, a throttle coil k', and a core smoes the motor, whereby the auxilicry relays do not necessarily drop when the circuits ci their actuating coils are broken, but do so when the .motor current is Within sate limits-` All the switch mechanism in this figure is the saine as that in Fig. 1, with the exception oi the releys'theinselves. f

The relays associated with switches A, B and C, ere designated by the characters K, K', K2, respectively and are alike in every Each oithese relays comprises :in

`carrying a movable Contact nieniber W which cooperates with fixed .contacts k3 and 1.64. Upon closing the switch S' to its .nal position, switch l? is liist closed as before, and. then current passes from t ing device T through contact s2 oi'switch S,

Wire 16, coil kof relay K, auxiliary contacts Fiend 6 associated with the main switch actuating coil a, to Wire 14, thence to ground.

The actuating circuit for successive switches passes through the contacts k3 'and [t4 oi the find els'o through the auxiliary con.-

tacts 7y and Sassocieted with the inain switch A. Consequently both of these sets of contai-cts nnist be concurrently bridged in order for a' succeeding switch to be closed. The rem lay K is inade qi1'icl-actin.g like the relays .Ci-G2 of Fig. 1, so that its contacts are broken before'the nia-1n switch has tnne tok close. Then the inain switch closes, its ecn tuatii'ig circuit and that ot the relay it; is

broken at contacts 5 and t5, butge ineiiitaining circuit for the ninin si tch estel'ilisheil et contacts 3 end e as beiore.- 'Vhen the main switch A. closes, the auxiliary contact :member bridges the contacts and S so that, :is soon the contacts of the relayl are closed, the actuel-ing circuit for the iol-- lozvii'ig switch B is establislied. ll, upon closing the switch A, the niotor current is increased to too great an amount, the current passing through throttle coil li" of the relay Yl is sulficient to hold the core of the relay in its raised position, and therefore the actu ating circuit for the next succeeding switch is not closed until the rnotor current drops within safe liniits and permits the core oi the relay to tall. "in the sainel manner switches B, C, and D are closed, but each one only after the closing of the switch iininedim etely preceding end when the niotor' cui-reif` .is within prescribed limits.

ln zich oi the inediti/cations illustrated, the n'min switches, except the iii-st, are posiM tively prevented from closing until a dciinite interval of time hns elapsed alter the closing oi a succeeding switch. 'lhis time interval is obtained without the use of (lash pots or `devices for 'ietarding the various elements after their actuating 'means have been energized, sind has atall times a deiinite value and .one which will allowainple time for the current collectthrottle to act in ease the closing ot e switch has caused too greet'a rise in the inotor current.

in Figs. 4 and 5 l have illustrated a construction of main and auxiliary switches suitable for use in systems arranged in accordance with the present invention.- The inechanical construction of this switch mecha ism ior'ins no part oi the present invention, however. The main svvitch comprises iixed and'niovable contacts 17 and 18, respec tively, the contact 1S being carried upon the outer end of interni 19 which is in turn supported at the in'ner end upon a bow spring 20. The core 21 lof the actuating electro- Imagnet Z2 is pivot-ally connected to lever 213 at 24, this lever being in turn pivoteil to A the fixed ,trainees et 12.5.V Motion is trans initted .directly to the lever -3 by the core 21 and thence to the arin 19 through a spring 26 located between the said arin and the lever 23. The spring 26 permits the core 21 and the lever 23 to move a short distance after the, contacts 17 and 18 corne into engagen'ient. The movable auxiliary contact meinbers, l(k12, are slidably mounted 'upon e stein 27 which is guided at one end by a brecltet 28 and secured et its other end to a lever 2), The contact members 9--12 are arranged in pairs between collars 30, 31, end 32, 33, and the members oi each peir are spaced apart by springs 34 and 35. The lever 29 is. pivoted. to the freine at 36 and is loosely connected tothe lever 25? at 37,

The parte are shown in the positions which they ocinipy when the niain switch is closed, the auxiliary Contact nienibers 9 anelli being in engagement with their cooperating iixed contacts. niiihcn the main switch is open, contacts itl end 12 engagevitli their coi'pernting contacts and the` collars El() and 'Sfhohl the contacts 9 antlll away from their copeieting contests. lil/*hen the electron'iegi'ict is energized, the core thereor the contacts 17 and. 18 are brought into engagement with each other and then, as the springI is compressed, contacts l() end 12 arc retracted and, contactsl and 11 placed in operetiigeposition. The main switch is therefore fully closed. before the auxiliary contacts'eie actuated and, by properly adn justing the parte, any desiredl'tiinc interval may be lcaused to chips@ between the closl ing ci the :main switch andthe operation oi the auxiliary cimtacts associated therewitli, V-This tii'nc interval is snflicient to enable the inotor current to reaclrits maximum velue citer the closingl oi :i main switch sind before the actuating circuit 'ci' the relays is broken.

Although l have shown and described the two best 'forms oi the present invention now ln'iown to inc, l. do not desire to liinit the present invention to the particular 'lorn'is shown, or either o'l them, except to the cr;-

'ranged tent indiooiioil. in the ommmlml Claims, sino@ to Sur@ SMQS. is,-A rios oi`V swichos iii`- to Clos@ iu :iuioiuaio progression, and IQlziys mochziui 'allgv infrlopfcmlvzilv oi ilu.x switches for posiiivclly fuusiuf; zi proihiiwminori iutorviil ol' limo lo @lapso bctwoon ihn Closing oi" surcessiw 'bx'.itchos.

2 in ooiuhiimtiou, :i sorios oi sivichis zirreiugod to clos@ iu iutoiuatic progression, mul moans of Savill swichn ixiochuuicalli iiulopourlmil of tiu'io to ohipso l oi\oou lilo Closing ol' ouch of said swiirhos null rho suwvorliiig svfichvs.

3. iu :i voutrollorI :i sorios oi swiiffhfs zii'- raugoil to iloso iii uulouizilio irogrossiou, and n, sopa-rolo rohiy associzilmi with oooh swilch for controlling rho oporziiou oi' u .suroooiling awiih.

i, in ('omhiuzi'iiou, u sorios olswiiihos :1rrziugoil lio close iii :iutoumiio profg'rossioii, :i rolfiy ussociilofl with ouch ol' n phuzilit-i of the svfil'chos 'for mmrolliug' tho oprrutiou 'of suffi-Coding si'vilrhL-s, zuul iumius oporiiliwly rohiloil lo nach of saiil swit'vhos for uitrollin;r iis relay.

l2. Yin u, voiilrolhi" :i serios oi switches armi'igrll lo closo in uutomniic progromioig: rohiy nswriziiml Wih :uu-.h Switch ior Couroiliug tho oiwi'ut ion ol' :i sulcooiliiig switch :iiul murs ooriuliil iiilh 'mich sivii'ih iol' roizlrolliii;r tho rolziy :unl :i succiwlliug siviich.

7. iii :i miilrollor, :i sorios o1" sivilohos uilrzipil lo Glob-o iii automatic progrossion, movtroiiiignolio (foiiirolliugr nun-ms for ouch Switch, i rolziqv usociliioil with ozuh switch for producing :i iloliuilo limo iiilorrol holrvovii ih@ rlobing thoi'iof :md oi tho Juxt` suri'ililiug' sivilrh, :md rhilwl with @urli svfilrh i'or Qlorlirouizigiiolic foiilrollii'ig iuozuis ola ii sur (fossiro swiiih.

N. in romhiiuilioii, zi sorio o1" swi mlupiill to flow iu uuloiuulio olorromagnoli@ :wluoiiug mouais for ouch Sxviii'hos.

ziclzipcll fhoreoiV 'ior musing :i pi'oiloloi'iiuiioii informi.

switch, :i relay associated with @sich switch for controlling the aol-rioting; moans of :i succomling switch, und auxiliary contacts associated with wich siviluh for ooiitrolling iis relay and tho circuit of tho actuating 11103113 oi :L succeeding s\\'il'oh.

5h11]-coiubiiiutioir, a. serios oi' switches n lziptod io Clos@ in zi-utonmlio progression, olooiroiimgnrti(- ficituzitiiig moans therefor, a rohiy :issociuitofl with oooh switch :uid conlrolliiig tho actuating circuit ol' ai succeeding milch, :uid auxiliary contact associated viih oooh switch i'or Controlling ihf rolov. :isslwmlioil with mich oi Oort-uu serios of switches vlo clos@ iii :iutonmtio progression, loilroumguvlio actuating iuiimS for Said olootroiungn-otio rohiys assooizilod with Puuh of i plurziliy of said swil'ichis for Closing lh@ CircuitY oi' the actuating' imnns lor ono switch u proilvt'oriuiiiod iiilorvzil of timo ulivi' lh@ prormliiig switch has boon Closol, moons for mirroir/,ingr tho nrtufiling moans of ouv switch mul its rohijv, und mouais fissooiziloil with wu'h Switch for rloiurgizing ils: relay.

l1. In :i motor conlrollor, :i Sories of switohos iirruugcil lo oloso in automatic pro grossion, olociroiiuigiiolic .-io'ufiting moans l'or Suhl swi chos, :i rohiy wsociziiofi Wil h mich swilih for coiilrolliiig' lh(` :ufl'uzriliiig circuit ol'v u, sur'rloiliiig-Siritvh, menus associated wih nach swit'f'h l'or omuroliing rho roh'iy :uul :i suriwmliiig suii'fh, mul. mouais rozirolloil hy moor rurrou` lor proroiiliiig the :uitoihulio pi'ogrossuiii when lho ouri'uiit CX- wells :i ilirofloioi'miiioil Yzi-luo.

i2. iii coiuhiimlimil.' o serios of ,witohos arranged to #low in iuiioiuziiic progrossioii, :i rohiy zissocialoil u'ilh @zich olE :i T )lurziliizy oi lh@ siviohos for controlling tho oilmriiion ol` succeeding Switches, moons operatively roluziil to auch of said siviiohos i'or ooiilrolling its relai?, :urli :i holding coil associated with each rohiy sind miorgizuil h v motor curroiii.

i3. in Cnunbiiiatiori, u' soi-iol; of Switches arranged to oloso in automatic rirogiession, :mi ai, relay associated with oooh of :i plurality oi said switches 'for controlling the operi ioii of succeeding six'illolios, x:ich of said rohiys having i, coil in tho control circuit :uid :motihir i'oil in .,ho controlloil ourcuit.

lil uitiioss- \\'ho i'ool', l. hay() horiluiilo Het my luuul this (ith l.-i ol'Y March, 1005.

ALEXANDER HUNTER.

lu, lu (-oiuhiimiion. i

Witiiossos:

Mammut: B. NULL, Ilicmm (humm). 

